package demo1;

public class Rect extends Shape{
    private double length;
    private double width;
    public Rect(double length, double width) {
        this.length = length;
        this.width = width;
    }
    public void draw(){
        System.out.println("矩形：length="+length+"width="+width);
    }

    public void calcArea(){
        area = length*width;
    }

}
